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J.B.A R0HER,

FURNAQB.

No. 492,653. Patented Peb. 28, 1893'.

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l FURNAGE. No. 492,653.

Patented Feb. 28, 1893.L

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I'UNITED STATES PATENT OFFICE.

JOHN B. ARCHER, CF WASHINGTON, DISTRICT OF COLUMBIA.

FU RNACE.

SPECIFICATION forming part of Letters Patent No. 492,653, dated February 28, 1893.

Application led April 1| 1892. Serial No. 427,368. (No model.)

T0 a/ZZ whom t may concern:

Be it known that I, JOHN B. ARCHER,a citizen of the United States, residing at Vashington, in the District of Columbia, have invented certain new and useful Improvements in Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain improvements in furnaces for burning gaseous fuel, and in the process hereinafter to be described by which the complete combustion and consequently the maximum effect of the fuel is obtained.

Reference is to be had to the accompanying drawings, wherein the same parts are indicated by the same letters.

Figure l represents a vertical longitudinal section of my improved furnace arranged to heat a Babcock da Wilcox boiler. Fig. 2 represents atransverse vertical section along the lineazxof Fig. Land looking to the left. Fig. 3 represents a plan view of the furnace, the boiler being removed. Fig. 4 represents a vertical section along the line y y of Fig. 3, looking across the furnace, parts being omitted. Fig. 5 represents a perspective view partly broken away of one of my tile air-fines or tuyeres. Fig. 6 represents a vertical longitudinal section of my improved furnace ar ranged to heat a horizontal tubular boiler.

A and A represent the boiler. B and B the walls of the furnace.

b, b', b2, and b3 are walls made of fire brick.

or tiling.

b4 represents a refractory cap over the walls b2 and b3.

b5 represents a serrated lining of fire brick or tile.

b represents a layer of broken angular fragments of fire brick, and 197 is a layer of sand. C represents the gas pipe for the supply of containing the gas, while the pipe `C4 goes somewhere near the center of the furnace beneath the plate M, and has a branch C5 leading to the rear of the furnace.

D represents an air supply pipe furnished with a blower, not shown, for a forced draft.

D is an air pipe, controlled by the damper d', and leading to the air chamber G beneath the center of the furnace.

D2 is an air pipe, controlled by the damper d2, and leading to the air chamber H, whose branches H extend along the sides of the furnace.

F is a lever for moving the grid iron damfperf across the grating f2 for further regulat-ing the quantity of air admitted into the upper part of the side chambers H.

K, K are tile cylinders perforated longitudinally; they are set in the plate M which is protected from the high heat of the furnace by the layer of sand and fire bricks laid thereon.

7c, lo, are nipples made in one with or iet into the tiling on the wall b2.

The operation of my device is as follows:- The gas is turned on through C into the space above the plate M, and at the same time air is admitted toCr and H through D' and D2; the air from D comes up throughthe tuyeres K, unites with the carbon forming a mixture of CO, CO2, and N; afurther supply of air en tering from H through the tuyeres 70,-converts the CO remaining /into CO2 insuring perfect combustion. By regulating the supply of air admitted through the tuyeres K and lo in pro# portion to the iow of gas, the exact supply of oxygen to complete combustion may be admitted, and the great loss of heat usually carried off by the large excess of air in the products of combustion from open furnaces may be avoided. Moreover, the iercest heat of the furnace is generally not far above the grate bars, while with the furnace herein described; by regulating the supply of air passing the damper d so that about sixteen parts by weight of oxygen may be admitted to every twelve parts by weight of carbon admitted above the tuyeres K, then the carbon will be converted into CO, developing forty-five hundred units of heat in the lower partof the furnace; while the heated gases rising meet a sufficient supply of oxygen admitted through loo - ately below the heating surface of the boiler.

Another merit in the furnace described is that it obviates the danger incident to contraction of the boiler sheets upon sudden changes of temperature of the furnace, and' prevents the wasteful formation of soot and smoke.

ons and the holes small, the air is. always highly heated by passing through the hot tuyeres, and enteringin small streams it mingles everywhere With the gas insuring vccmplete combustion.

While I have only alluded to the carbon in the gas, thefbenetlts to be obtained from this process and apparatus with respectto the combustion of the free hydrogen would be very great.

WhileI have only shown my invention as applied to two kinds of boilers; it Willbe obvious that itis equally applicable tovertical tubular boilers, and furnaces of a vast variety of description.

I claim as newvl. tInagas furnace, the combination with inclosing Walls of fire-proof material7 of an air chamber With'means of controlling the admissionof air thereunto; ya combustion'chamber adjacent to the said air chamber; aperforated metal plate separating the said air chamber and combustion chamber; aplurality of refractorytuyeres over the perforationslin said plate and extending into the combustion cham- Thus by having the gas admitted in"` several places and having the tuyeres numeri ber; a second air chamber with means of controlling the admission ot' air thereunto, said chamber having lateral passages running along the sides of the combustion chamber; a plurality of tuyeres projecting into the said combustion chamber and connecting said latleral passages With'said chamber, and a pipe or pipes for the gas entering said combustion chamber near said plate, substantially as described.

2. In a gas furnace, the combination with inclosing Walls ofvire-pro0f material, of an air chamber With'means of controlling the admission of air thereunto; a combustion chamber J OI-IN B. ARCHER. Vitnesses:

JOHN C. WILSON, IPEROYC. `BOWEN. 

